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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5844dd0492ea9a384261d056f497cf03d203656900b672efff24e4b17b963f58' 
  AND token = 'g2qd55kz8l1pedY71f/01C0D1h3WBLTs4COI+I/WvYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}